دانلود رایگان مقاله لاتین عایق الاستومری از سایت الزویر
عنوان فارسی مقاله:
عایق الاستومری فیبر تقویت شده برای جداسازی لرزه ای پل
عنوان انگلیسی مقاله:
Fiber reinforced elastomeric isolators for the seismic isolation of bridges
سال انتشار : 2016
برای دانلود رایگان مقاله عایق الاستومری اینجا کلیک نمایید.
مقدمه انگلیسی مقاله:
1. Introduction
Earthquakes are one of the most devastating types of natural disasters, which often result in loss of life, a large number of structural failures, and significant socio-economic costs. As it is not possible to prevent earthquakes from occurring, designers must focus on mitigating their effects. This can be accomplished by either increasing the capacity/ductility of the structure or decreasing the seismic demand placed on the structure. While increasing the capacity/ductility of a structure has traditionally been the approach employed, it is not always the most effective [1]. Alternatively, decreasing the seismic demand placed on the structure can be achieved through base isolation, and is considered to be one of the most effective methods to reduce seismic induced damage [2]. Base isolation in bridge applications can be achieved by introducing low lateral stiffness elements, which are able to adequately support the vertical loads, between the superstructure (i.e. deck/ girder) and substructure (i.e. pier/ abutments) as shown in Fig. 1. When these flexible elements are used to accommodate nonseismic induced rotations and lateral deformations experienced by the girders, they are typically referred to as bearings. However, they are often referred to as isolators when employed to reduce and redistribute seismic induced lateral forces (i.e. seismic isolation). Their low lateral stiffness shifts the period of the structure into the displacement sensitive region, where the resulting inertial forces are significantly reduced. This results in a reduction in the seismic demand on the structural elements. The loading demands on bridge bearings have increased due to continued developments in bridge design, such as the introduction of frames with much larger spans and innovative forms (ex. curved and skewed girders) [3]. In order to handle this increase, improvements to existing bearing types and the development of new bearings types are needed. Consequently, recent research efforts have focused on replacing conventional isolators with more innovative types that can accommodate larger loads and deformations [4]. There are two primary types of seismic isolators: (1) sliding and (2) elastomeric [5]. The sliding isolation system is based on the transmission of lower shear forces to the structure through a medium with a low friction coefficient that is placed between the structure and its foundation. Sliding isolators are typically either pure friction isolators or friction pendulum isolators [6]. Elastomeric isolators, which have the combination of high stiffness in the vertical direction as well as rotational and horizontal flexibility, are among the most widely used type of seismic isolator. Elastomeric isolators are reinforced with steel plates, which result in a high vertical stiffness by limiting the bulging in elastomer layers. They are typically divided into three isolator types: low-damping
برای دانلود رایگان مقاله عایق الاستومری اینجا کلیک نمایید.
کلمات کلیدی:
Analysis of Fiber-Reinforced Elastomeric Isolators Analysis of Fiber ... https://www.researchgate.net/.../267792661_Analysis_of_Fiber-Reinforced_Elastomeric... Jan 30, 2017 - An analysis is given for the mechanical characteristics of multilayer elastomeric isolation bearings where the reinforcing elements-normally ... Design and manufacturing of fiber reinforced elastomeric isolator for ... https://www.researchgate.net/.../248251422_Design_and_manufacturing_of_fiber_reinf... The fiber reinforced elastomeric isolator (FREI), in contrast to the steel reinforced elastomeric isolator (SREI) which is assumed to be rigid both in extension and ... [PDF]Modeling of Fiber-Reinforced Elastomeric Base Isolators www.iitk.ac.in/nicee/wcee/article/WCEE2012_1854.pdf by A Das - Cited by 4 - Related articles Modeling of Fiber-Reinforced Elastomeric. Base Isolators. Animesh Das. Research Scholar, Civil Engng. Deptt., IIT Guwahati. Anjan Dutta. Professor, Civil ... [PDF]influence of end geometry on fiber reinforced elastomeric isolator ... www.iitk.ac.in/nicee/wcee/article/14_11-0046.PDF by MJ Tait - Cited by 3 - Related articles KEYWORDS: stable unbonded fiber reinforced elastomeric isolator (SU-FREI), end geometry, stable rollover, unbonded application, laminated rubber bearing ... Evaluation of horizontal stiffness of fibre‐reinforced elastomeric isolators onlinelibrary.wiley.com/doi/10.1002/eqe.2879/abstract by T Van Ngo - 2017 Jan 31, 2017 - Summary. Unbonded fibre-reinforced elastomeric isolator (U-FREI) is relatively new seismic base isolator in which fibre layers are used as ... Images for Fiber reinforced elastomeric isolators Image result for Fiber reinforced elastomeric isolators Image result for Fiber reinforced elastomeric isolators Image result for Fiber reinforced elastomeric isolators Image result for Fiber reinforced elastomeric isolators Image result for Fiber reinforced elastomeric isolators More images for Fiber reinforced elastomeric isolators Report images [PDF]Report - Pacific Earthquake Engineering Research Center - University ... peer.berkeley.edu/publications/peer_reports/reports_2001/0111.pdf by FRE Isolators - 2001 - Related articles PACIFIC EARTHqUAKE ENGINEERING. RESEARCH CENTER. Analytical and Experimental Study of. Fiber-Reinforced Elastomeric Isolators. James M. Kelly.
